Help! Which biological molecule transports substances between cells?

A. carbohydrate

B. lipid

C. nucleic acid

D. protein

Membrane proteins

The cell membrane is selectively permeable . It lets some substances pass through rapidly and some substances pass through more slowly, but prevents other substances passing through it at all.

D

Membrane proteins

The cell membrane is selectively permeable. It lets some substances pass through rapidly and some substances pass through more slowly, but prevents other substances passing through it at all.

Explanation:

micro/nanoscale topography surface exhibits many prominent properties and is extensively employed in biomedical device, microfluidic device and energy device fabrication. additionally, the clinical applications of biomaterials can be largely expanded with of nanostructured surfaces.

if you add everything up correctly you should get 69 i got this because 50 plus 19 is it